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Operating costs (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Labour costs    
Wages, salaries and related taxes and benefits $ (4,354) $ (4,250)
Post-employment benefit plans service cost (net of capitalized amounts) (206) (249)
Other labour costs (1,063) (1,054)
Less:    
Capitalized labour 1,217 1,136
Total labour costs (4,406) (4,417)
Cost of revenues (7,926) (7,641)
Other operating costs (1,924) (1,917)
Total operating costs (14,256) (13,975)
Research and development expense $ 90 $ 57